Icon for a portion of a display screen



FIG. 1 is a front view of an icon for a portion of a display screen; and,

FIG. 2 is an enlarged front view thereof, the icon is shown separately for clarity of illustration.

The portion of the display screen shown in broken lines in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an icon for a portion of a display screen, as shown and described. 